Paging the Foccer font of all knowledge...!
A bit of a long explanation to start with...
My 3 bed house (built around 1900) didn't have a bathroom when it was constructed.
There was a "back door" between the (central) stairs and the kitchen, leading to an alleyway down the side of the house, but then someone built a utility room (with a new back door) on the back of the house with the wall extending the whole width of the property, including blocking the alleyway.
They then put a wall halfway down the alleyway and a sloping roof down from there to the new back wall of the house (ie the one that goes across from the utility room)
So I have a bathroom which is (internally) about 10' x 4' and the ceiling goes from 7'2" at one end to 5'6" at the other end.
Some tiles fell off the wall by the bath yesterday, so I've decided that I'm going to get rid of the bath, put in a shower cubicle and get it insulated properly, because the walls at either end and along the alleyway wall are all single-skinned with just a layer of fibreboard between them and the tiles, which means it's an absolute fridge in the winter!
The only good thing is that the sloping roof is insulated, because, when we've had snow and the heating has been on in the bathroom, the snow on the roof has not melted.
What I want to do is to get some foam blocks or panels to insulate the outer walls (the inside wall doesn't need it), but I don't know whether this is something I could do myself or whether I'd need to get it done professionally.
Also I'd need to finish the inside surfaces somehow. Can I just paint over them or would there be more to it?
Attached are some pics: Bathroom-1 shows the door in (I bodged a temporary fix where the tiles came off with some clingfilm and gaffer tape!)
Bathroom-2 shows the left wall (as you go in). I want to get rid of the bath, put in a shower cubicle and insulate the left wall and the long wall section behind the bath where the tiles fell off.
Ideally (I think there's enough room under the floorboards and joists) I'd like to get the shower pan sunk into the floor as my girlfriend is 6'1" and can't get under the shower properly at the moment.
Bathroom-3 shows the basin which is on a boxed-out section (I think there is probably a brick pillar behind that) and the loo and right wall.
Given the lack of space around the loo, it may need thinner insulation otherwise there's nowhere to go
but given there's sod-all insulation at the moment, anything would be a benefit!
Has anyone used this sort of insulation and could comment?